JP2001050168A - Direct coupled water supply type water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress temperature-rise in a circumferential wall space housing a pump by forming a motor part for driving a pump part of a pump out of a brushless motor using a permanent magnet for a rotor, in a water supply device with water suction side of the pump housed in the space directly coupled with a water service pipe. SOLUTION: A frame 1 is composed of a square back wall 2 and a U-shaped skirt plate 7. The back wall 2 is composed of a square back plate extending vertically, a top plate disposed on an upper edge of the back plate, and a side plate 5 disposed on a side edge thereof. A water supply pump apparatus 20 is disposed in the back plate. Namely, an accumulator 22 is assembled with a lower side of a control board 21, and a vertical pump unit 23 is assembled adjacent thereto. In a pump unit 23, a plurality of vertical multistage turbine pump parts 26 are disposed in parallel with each other. They are formed in such a constitution that a motor that is a brushless motor 24 in which a permanent stone is used for a rotor is disposed on an upper part, and a pump part directly connected to a lower part of the pump unit 23 that is a vertical multistage turbine pump part 26 in which a multistage turbine pump part 25 is arranged is disposed on a lower part thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct water supply type water supply apparatus for supplying water to a home, for example.

[0002]

2. Description of the Related Art In apartments and condominiums, a water supply device is connected between a water supply pipe extending from a water supply main pipe and a water supply pipe connected to a household faucet, and pressurized water from the water supply pipe is directly supplied to the water supply apparatus. The pressure was increased by a pump and supplied to each household. A system in which a water supply device is directly connected to such a water pipe to supply water is called a direct connection water supply system.

In such a water supply device, in consideration of outdoor use, a pump, a control panel, and the like are housed in a space surrounded by a wall, that is, in an airtight container formed by a pump cover or the like, and the In order to prevent intrusion and noise, it is necessary to prevent noise from going outside.

In such a water supply device, a structure in which a pump section is directly connected to an induction motor is employed.

[0005]

By the way, the water supply apparatus uses a closed container whose internal capacity is reduced as much as possible in order to reduce the size and the floor area occupied. In particular, a sound absorbing material is attached to the inner surface of the closed container for noise reduction, and the closed container itself has high heat insulation.

For this reason, the temperature of the inside of the closed container tends to rise due to the operation of the pump. In particular, most of the heat generated during the operation of the pump is generated by the motor.

[0007] Therefore, the heat from the motor with the fan,
Although measures have been taken, such as cooling by guiding the pipes through which water circulates, an excessive rise in temperature is likely to affect electrical equipment such as a motor and a control panel.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a direct water supply type water supply device capable of reducing a rise in temperature of a housing space containing a pump.

[0009]

According to a first aspect of the present invention, there is provided a water supply apparatus of a direct connection type, wherein a brushless DC motor using a permanent magnet for a rotor is used as a motor for driving a pump unit. The temperature rise of the storage space is reduced.

That is, unlike an induction motor, a brushless DC motor using a permanent magnet for the rotor has no copper loss in the rotor, and thus has a small heat loss and generates little heat during the operation of the pump. Can be suppressed. As a result, a rise in the temperature of the housing space can be reduced.

In the water supply apparatus according to the present invention, in addition to the above object, the pump using the brushless DC motor stopped at the time of high water distribution (when the suction pressure exceeds the target pressure) is started smoothly. In order to solve this problem, a means for applying a reverse rotational torque to the motor is provided so as to stop the rotation of the motor rotating by the water passing through the pump section when the pump is stopped.

That is, unlike an induction motor, a brushless DC motor detects the position of a rotor and
It is required to always control the phase of the current flowing through the stator coil to synchronize the actual rotation speed of the rotor with the target rotation speed on the drive side.

[0013] The direct water supply type water supply device may have a characteristic behavior at high water distribution.

That is, at the time of high water distribution, the suction pressure increases, and water is supplied through the inside of the stopped pump unit. At this time, the rotor may be rotated by the water flowing through the inside of the pump unit. At this time, the rotor is rotating while the pump is stopped.
Here, when the suction pressure of the pump decreases due to the pump starting pressure, the pump attempts to start. At this time, the motor is rotating despite the fact that the original target rotation speed is 0, Synchronization becomes impossible, and a failure may be detected.

Therefore, when the pump is stopped and the motor that rotates by the water passing through the pump section rotates, a reverse rotation torque is applied to the motor to prevent the rotor from rotating. Rotation speed is 0
From now, the motor is rotated by the current phase control.

According to a third aspect of the present invention, a pump using a brushless DC motor, which is also stopped during high water distribution (when the suction pressure exceeds a target pressure), is started smoothly when the pump is started. In order to make such a configuration, when the pump is stopped, means for monitoring the number of rotations of the rotor, and when starting the pump, means for synchronizing the number of rotations of the monitored rotor with the target rotation speed are employed. When the pump is started, the target rotation speed is synchronized with the actual rotation speed of the rotor, and the motor is rotated by current phase control.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on a first embodiment shown in FIGS.

FIG. 1 is a front view of a direct water supply type water supply apparatus to which the present invention is applied, FIG. 2 is a front sectional view of the water supply apparatus, and FIG.
(A), (b) or FIG.
D is a side sectional view as viewed from D, FIG. 6 is a front view showing a water supply pump piping system of the water supply device, and FIG. 7 is a diagram showing a structure of each part of the water supply device. It is a gantry.

The gantry 1 is formed by combining a square back wall 2, a U-shaped skirt plate 7, and a pair of right and left anchor plates 15, as shown in FIG.

More specifically, the back wall 2 includes a rectangular back plate 3 extending vertically in the vertical direction, an inward top plate 4 formed on the entire upper edge of the back plate 3, and a continuous And an inward side plate 5 formed on the entire left and right edges of the back plate 3. The top plate 4 and the side plate 5 on these three sides are
Both protrude a small amount in the front direction, for example, about 40 mm, and the rigidity provided by the top plate 4 and the side plate 5 protruding inward causes the back wall 3 formed of a plate to have:
Ensuring sufficient mechanical strength for mounting the pump without problems such as stickiness. From the lower portions of the left and right side plates 5, a band-shaped plate bent in a U-shape protrudes in the front direction, and forms a U-shaped skirt plate 7 at the lower portion of the back wall 3. On one wall of the skirt plate 7, for example, the left wall, a through hole 9, a drain hole 10, and a cable hole 11 for a suction pipe for forming a pipe connection with the outside from the side are formed in order from the depth side. ing. The right wall of the skirt plate 7 is formed with a through-hole 12 and a drain hole 13 for a discharge pipe for making a pipe connection with the outside from the lateral direction in order from the front (front) side. A band plate is attached to each lower end of the side plate 5 from each lower end of the left and right sides of the skirt plate 7, and a pair of left and right anchor plates 15 is formed at a lower portion of the gantry 1. As a result, the gantry anchor plate 15 is turned down,
A stand 1 having a small depth dimension and a high height is configured to stand on its own. An anchor bolt insertion hole 15a (shown only in FIG. 7) is formed in the plate surface of each anchor plate 15.

On the inner surface of the back plate 3 forming the gantry 1,
A water supply pump device 20 is assembled. That is, the inverter 21x and the control unit 2
A rectangular box-like control panel 21 incorporating various control devices such as 1y (for example, one having a microcomputer: shown in FIGS. 3 and 7) is assembled via a bracket 21a. An accumulator 22 is mounted below the control panel 21. On the right side of the back plate 3, a control panel 21 and an accumulator 2
2, a vertical pump unit 23 is assembled.

More specifically, the pump unit 23 is provided with a motor, for example, a brushless DC motor 24 using a permanent magnet for the rotor 24b (hereinafter simply referred to as DC motor 2).
4) and a pump section directly connected to the DC motor 24 at the bottom, for example, a vertical multi-stage turbine pump 26 having a multi-stage turbine pump section 25 (hereinafter simply referred to as a pump section). A plurality of units, for example, two units are arranged in parallel in the left-right direction, and a suction side merging pipe 27 and a discharge side merging pipe 28 are combined with this.

Specifically, the DC motor 2 is configured as shown in FIG.
As shown in (b), a fully closed motor in which the rotor 24b and the stator coil 24c are housed in a closed case is used. The sealed case also houses a rotor position detection sensor 24d for detecting the rotor position. In addition, a cooling fan of a type that sucks in from an upper suction port 29a and blows out from a downwardly directed outlet port 29b along the outer peripheral surface of the motor body is provided as a cooling fan on the upper part of the fully closed motor (shown only in FIG. 2). ) Is built-in.

The multi-stage turbine pump 26 has a suction casing 31 having a pump suction port 30 which opens downward and opens downward, and a pump discharge port 3 which opens upward and opens frontward.
A plurality of intermediate casings 35 accommodating the impellers 34 are fastened to a discharge casing 33 having two impellers 34 (both shown in FIGS. 3 and 4), and each impeller 34 and the motor shaft 24a extending from the DC motor 24 are connected. A connected structure is used. Each pump suction port 3 of these multi-stage turbine pumps 26
0 is an on-off valve for maintenance, for example, a ball valve 36.
The suction side merging pipe 27 extending in the left-right direction is detachably connected via, for example, a flange connection. The suction side merging pipe 27 has a left end closed by a plug 37 and a right end bent downward so as to draw an inverted L-shape and extends substantially vertically. Note that a heater 3 for preventing freezing is provided on both sides of the pipe portion 27a extending in the lateral direction of the suction side merging pipe 27.
8 is assembled. Each pump discharge port 32 of the multi-stage turbine pump 26 is connected to an L-shaped connecting pipe 40 extending downward from the discharge port 32 (shown in FIG. 6). An elbow portion 40a (approximately 9
Swing check valve 40b
Is built in. The lower end of the connecting pipe 40 extends from the position of the pump suction port 30 to a point below.
At the end of the connecting pipe 40 shifted downward from the pump suction port 30, similarly to the suction side, a discharge-side merging pipe 28 which is bent to draw an inverted L-shape via an on-off valve for maintenance, for example, a ball valve 41. Are connected by flange connection. A pressure detector 17 for detecting a discharge pressure is attached to a left end of a pipe portion 28a extending in a lateral direction of the discharge side merging pipe 28. A pipe portion 28 extending downward from the discharge side merging pipe 28;
b is arranged (substantially parallel) so as to face a pipe portion 27b extending downward of the suction-side merging pipe 27. In the middle of the pipe portions 27b and 28b, there is connected via a bypass portion 43 for bypassing to the discharge side when the water distribution is high (when the pressure on the suction side is higher than the target pressure) (shown in FIG. 4). The bypass portion 43 includes a pipe portion 27b and a pipe portion 28b.
A bypass pipe 44 (bypass path) communicating between the two.
And the discharge side merging pipe 28 housed in the bypass pipe 44.
And a bypass check valve 45 having a function of opening only in the direction toward the side.

A flow rate detector for stopping a small amount of water (a pump for stopping the pump as the amount of water becomes smaller than the target amount of water) is provided at a pipe portion 27b of the suction side merging pipe 27 extending from the bypass check valve 45 to the pump suction side. ), For example, a paddle type flow detector 46 is incorporated. In addition, a heater 47 for preventing freezing is also attached to the pipe portion 28a extending in the lateral direction of the discharge side merging pipe 28.

In the pump unit 23, the both ends of the pipe portion 27a (the portion extending in the horizontal direction) of the suction side merging pipe 27 are staggered sideways across the pipe portion 27 as shown in FIG. Rectangular support base 48 overhanging
Is formed. At the end (pressure detector 17 side) of the tube portion 28a of the discharge side merging tube 28 which is arranged to be shifted downward from the tube portion 27a, a rectangular support base 49 (which protrudes toward the tube portion 27a). 1) are formed.

On the other hand, in the middle part on the right side of the back plate 3, FIG.
As shown in FIG. 3, a support member 50 for mounting the pump unit is attached. The support member 50 has, for example, one end portion of a support member 51 formed of a sheet metal bent in a U-shape fixed to the inner surface of the back plate 3, and arranges both end walls 52 of the sheet metal in two vertical stages. A structure in which the other end of 52 protrudes from the inner surface of the back plate 3 is used. More specifically, the upper and lower end walls 52 have a triangular shape on the upper side and a band shape on the lower side. Sticking out. A flat rectangular elastic member 53 formed by combining a rubber member and a spring member, for example, is attached to the distal end side and the base side of the upper end wall 52 corresponding to the position of each support base 48. Have been. A similar flat rectangular elastic member 54 is attached to the distal end side of the lower end wall 52 corresponding to the position of the support base 49.

The pump unit 23 mounts each support base 48 on each installation seat formed by the elastic member 53, and mounts the support base 49 on the installation seat formed by the elastic member 54. The support span is set on the support member 50 in a stable posture, with the two intervals between the discharge pipe 27 and the discharge side joining pipe 28 as support spans. Then, as shown in FIG. 3, the support base 48 of the suction side merging pipe 27 protruding in the front direction.
By fixing the (only one base) to the support member 50 with fasteners and bolts 50a, the entire heavy pump unit 23 is arranged such that the suction port 29a of the cooling fan 29 is located at the top of the gantry 1. , Multi-stage turbine pump section 2
The suction side / discharge side pipes leading to 5 are stably assembled to the gantry 1 in such a position that they are arranged on the lower side.

It should be noted that the pump unit 23 is designed so that the head side does not swing due to the elasticity of the elastic members 53 and 54.
It is supported supplementarily at the high position of 3. For example, FIGS.
7, a bracket 55 protruding from the discharge casing 33 is attached to the inner surface of the back plate 3 so as to be elastically displaceable, for example, an elastic member 5 such as a rubber member.
The support unit 57 is laterally supported by a support bolt 57 elastically supported by the pump unit 6 so that the pump load is not applied, thereby restricting the pump unit 23 from swinging.

A damping member, for example, a viscous plate-shaped damping member 58 is attached to the inner surface of the back plate 3 near the support member 50, and the back plate 3 is transmitted from the support member 50. The structure does not swing due to the vibration of the turbine pump 26 (shown in FIG. 7). However, 3a is a reinforcing member provided continuously in the width direction on the inner surface of the back plate 3 so as to pass near the support member 50 (shown in FIG. 7).

Like the pump unit 23, the accumulator 22 is also provided with an accumulator at the distal end of a support member 59 (for example, made of a channel member) projecting from the inner surface of the back plate 3 in the direction of the front more than the overhang length of the side plate 5. 22
The support base 22a formed at the lower part of the base is fastened to the gantry 1 by fastening, for example, bolts.
The entrance 22b of the accumulator 22
However, it is connected to the discharge-side merging pipe 28 downstream of the check valve 45 via a maintenance on-off valve, for example, a ball valve 60 and a flexible pipe 61.

On the other hand, as shown in FIGS. 2 to 4, a rectangular opening 1 surrounded by a back plate 3, a side plate 4, and a skirt plate 7.
a has a drain receiving tray 65 so as to close the opening.
Is provided. The tray 65 stores, for example, a plate bent in a V-shape in a rectangular frame formed by the back plate 3, the side plate 5, and the skirt plate 7, and closes the opening 1a at a height away from the ground. The periphery of the plate is joined to the inner surfaces of the back plate 3, the side plate 5, and the skirt plate 7 in a watertight manner. Of course, the plate is assembled at a point below the through holes 9, 12 and the cable hole 11 so as not to lose contact with the outside. The tray 65 receives a drain such as dew condensation water dropped from the pump unit 23 or a pipe, and accumulates at a lowermost portion where a V-shaped inclined surface intersects. Thus, the water supply device can be used indoors. The plate surface of the tray 65 is formed with through-holes 66 for suction piping and discharge piping for forming a pipe connection with the outside from above and below. However, the through hole 66
Is closed with a cap 67 when not in use.

Drain water is guided to the left and right drain holes 10 of the skirt plate 7 (lower than the lowermost portion of the tray 61) from the lowermost portion on both lower sides of the lowermost portion of the tray 61 forming the collecting portion. A fitting, for example, an elbow 68 is attached. The end of the elbow pipe 68 facing the outside (the outer surface of the skirt plate 7) is usually closed by a cap (not shown). If the cap is removed and a drain pipe (not shown) is connected instead, Drain water accumulated in the tray 65 at a desired location can be drained.

In the lower part of the back plate 3, a backflow prevention device 70 (intermediate chamber 70a and intermediate chamber 70a) extends in the left-right direction.
The suction pipe 71 to which the pair of the check valves 70b arranged so as to sandwich “a” is assembled is assembled in the same manner as the pump unit 23. Note that 7
Reference numeral 0c denotes a water leakage port (an outlet for draining backflowed water) of the backflow prevention device 70.

That is, the suction pipe 71 is arranged in order from the left side, for example, a downward elbow pipe 72 (entrance side) which can be connected to a water pipe 94 from a water main pipe, and a maintenance on-off valve 7.
3. The strainer 74, the backflow prevention device 70, and the upward elbow pipe 75 (exit side) are connected to each other. A pressure detector 72a for detecting a suction pressure (a pressure of a water main pipe) is attached to a corner of the elbow pipe 72 which is a primary side of the backflow prevention device 70. A plate 77 having legs 76 on both the left and right sides is attached to the side of the suction pipe 71. However, the leg portion 76 is formed by an L-shaped plate portion projecting from the side of the suction pipe 71 to below the suction pipe 71.

At the left and right sides of the lower part of the back plate 3, supporting members 78 projecting in the front direction more than the overhang length of the side plate 5 are attached. Each of the support members 78 has an L-band shaped plate having one end fixed to the inner surface of the back plate 3 and the other end fixed to the upper surface of the tray 65, and a flat rectangular elastic member attached to the upper surface of the tip of each plate. A member 79 (for example, formed by combining a rubber member and a spring member) is attached.

The suction pipe 71 including the backflow prevention device 70
As shown in FIGS. 2 to 4, the leg 76 is placed on each mounting seat formed by the elastic member 79, and the leg 76 is fastened to the support member 78 with a fastener, for example, a bolt, so that the back plate 3 is provided. It is assembled in.

An elbow pipe 75 (upward) end of the suction pipe 71 is connected to an on-off valve for maintenance, for example, a ball valve 8.
0, it is detachably connected to the inlet end of the suction side merging pipe 27, for example, by flange connection. With this arrangement, the check valve for bypass 45 is disposed on the secondary side of the backflow prevention device 70, and when the pressure on the water pipe side becomes higher than the target pressure, the pressure water from the water pipe merges on the discharge side through the check valve for bypass 45. The pipe 28 is designed to be bypassed.

A heater 81 for preventing freezing is attached in the vicinity of the pressure detector 72a which is placed in the environment where it is most easily frozen, for example, on the side surface of the elbow tube 72.

Then, the gantry 1 on which various devices are assembled
Is combined with a pump cover 85 covering the same device as shown in FIGS. 1 to 4, and various devices to be assembled are formed in a space surrounded by a wall, that is, the gantry 1 and the pump cover 85. It is housed in a high-height container with a small depth dimension. This constitutes a vertical outdoor-type water supply device.

More specifically, the inner diameter of the pump cover 85 is slightly larger than the outer shape of the gantry 1 as viewed from the front.
It has a box shape with two open sides on the back and bottom. The pump cover 85 is covered around the gantry 1 so as to cover each device from the front. Specifically, the upper surface of the pump cover 85 has an upper edge
The upper surface of the gantry 1 is covered from the front side so that the inner surface of the edge in the left-right direction overlaps the left and right side plates 5 and the inner surface of the lower peripheral portion overlaps the skirt plate 7 and the subsequent side plate 5. Is almost sealed. Then, the pump cover 85 and the gantry 1 are held between the two by means of eyebolts 86 for suspending the device (members used for suspending the entire water supply device), which are inserted into the left and right sides of the top plate 4 from both sides of the upper edge. Are fastened with a seal member interposed therebetween.
Reference numeral 89a denotes a bolt hole for an eyebolt formed on the top edge of the top plate 4 and the pump cover 85.

The pump cover 85 is similar to that shown in FIGS.
As shown in FIG. 5, the front wall 85a facing the turbine pump 26 is inclined in a direction in which the space between the front wall 85a and the DC motor 24 becomes narrower from near the middle stage of the connection pipe 40 toward the upper side, and the space is limited by the inclined portion 85b. As a result, on the front side of the DC motor 24, the short circuit of the cooling fan 29 (the air blown out from the suction port 29a is
9b). A sound absorbing material 87 is provided on the inner surface of the inclined portion 85b approaching the turbine pump 26 so as to effectively absorb noise from each portion of the turbine pump.

On the inner surface of the pump cover 85, the suction pipe 7 including the backflow prevention device 70 extends from a position above or slightly above the upper end position of the skirt plate 7 to an upper point.
A sound absorbing material 88 having heat insulating properties is attached so as to surround the periphery of the pump 1 and keeps the lower part of the apparatus where the internal atmosphere is the coldest, and at the same time, prevents internal noise from leaking from the lower end of the pump cover 85. .

In addition, a sound absorbing material 89 is attached to each part of the inner surface of the pump cover 85 so as to prevent noise from leaking from the pump cover 85 to the outside. Further, a metal fitting for preventing falling, that is, a plate 90 having a bolt insertion hole 90a is attached to the upper back surface of the back plate 3, and the plate 90 is attached to a wall of a building or the like when the water supply device is installed.
Is installed to prevent the installed water supply device from falling over.

A water leakage inspection window 91 is provided below the front wall 85a of the pump cover 85 for visually checking the leakage state of the backflow prevention device 70 from outside.
In addition, a window 92a for visually observing the various display units 21b of the control unit 21 from the outside and a window 92b for visually observing the pump state are provided in the upper stage.

When installing this water supply device, the anchor plate 15 is fastened to the installation place outdoors or indoors with an anchor bolt 93, and the plate 90
Is fixed to the water supply device by bolting it to a wall surface of a building or the like along the back surface of the gantry 1, and the water pipe separated from a water main pipe (not shown) using, for example, the through holes 9 and 12 of the skirt plate 7. 94 may be connected to the inlet of the suction pipe 71, and the outlet of the discharge side merging pipe 28 may be connected to a water supply pipe 95 connected to a faucet (not shown).

Here, the control panel 21 is connected through cables (not shown) wired along the inner surface of the back plate 3.
Connected to each device and each sensor.

The control section 21y of the control panel 21 is provided with a function of alternately operating the two turbine pumps 26 and, if one of the turbine pumps 26 fails, a function of replacing the other turbine pump 26 with the other. Further, the control unit 21y
When the discharge pressure drops from the set target pressure,
Inverter control of each pump 26 so as to maintain the target pressure, function of stopping the operating turbine pump 26 when the amount of water becomes low, function of starting the turbine pump 26 when the suction pressure falls below the set pump starting pressure. Is set. The operation of the DC motor is performed by the controller 21y detecting the rotor position based on a signal from the rotor position detection sensor 24d,
This is performed by controlling the phase of the current flowing through c.

The controller 21y is designed to generate a rotational torque in the reverse rotation direction when the rotor 24b rotates forward when the pump is stopped. To this end, for example, a switching unit 21z capable of switching the motor input terminal in the short-circuit direction is incorporated in the control panel 21, and the control unit 21y operates the switching unit 21z when the pump 24 stops and the rotor 24b rotates. Means for switching the input terminal in the short-circuit direction is used. That is, the control unit 21y includes:
When the pump is stopped, when a pulse signal indicating rotation is output from the rotor position detection sensor 24d, a function of short-circuiting the input terminal of the DC motor is set, and an electric braking force is applied to the rotor 24b by the back electromotive force. It is made to generate.

The control section 21y is set so that the phase current control of the DC motor is not started unless the rotor 24b is stopped (the number of rotations is 0). To be started.

Next, the operation of the water supply device thus configured will be described.

That is, it is assumed that the control unit 21y has detected that the discharge pressure is lower than the target pressure by the pressure signal from the pressure detector 17 on the discharge side. Then, the control unit 2
1y is one of the two turbine pumps 26,
Then, select a healthy pump (one unit) and start operation. Then, the turbine pump 26 is operated as an inverter so as to keep the target pressure constant (constant pressure control).

Thus, the turbine pump 26 increases the pressure of the water from the water pipe 94 sucked through the suction pipe 71 and the suction-side merging pipe 27 to a constant pressure. The water is supplied to the faucet through the side joining pipe 28 and the water supply pipe 95.

When the amount of water used decreases, the rotation speed (capacity) of the turbine pump 26 is reduced in accordance with the flow signal from the flow sensor 46. Further, when the amount of water used becomes equal to or less than the predetermined amount of water, that is, the amount of water called a small amount of water, the operating turbine pump 26 is stopped, and the operation shifts to water supply by the accumulator 22.

During the operation of the turbine pump 26, the components inside the pump cover 85 are cooled by the cooling fan 29 of the DC motor 24. Specifically, air in the uppermost layer in the pump cover 85 is sucked in from the suction port 29a, and is blown out from the outlet 29b along the motor main body of the DC motor 24. As a result, the blown air cools the DC motor 24 and flows to the pump section 25 through which water located on the lower side passes, and also to the pipe. At this time, the exhaust gas flow (hot air) whose temperature has risen due to the cooling of the DC motor 24 is cooled by exchanging heat by touching the outer wall surface of the pump unit 25 and the outer wall surface of the pipe member which are cooled by the supplied water. You. Then, the cooled exhaust gas flow is guided to each part in the pump cover 85 to cool each part and circulate through the pump cover 85.

At this time, heat generated by the motor for driving the pump unit 25 occupies most of the heat which causes the temperature inside the pump cover 85 to rise, but the motor for driving the pump unit 25 is a brushless DC motor. Since it is used, there is no copper loss of the rotor 24b, and the heat loss is smaller than that of the induction motor.

Therefore, by employing a brushless DC motor, the amount of heat generated by the motor can be reduced, the temperature rise of the housing space containing the turbine pump 26 can be reduced, and an excessive temperature rise can be prevented.

On the other hand, during the operation of the pump, when the water distribution is high, that is, when the pressure on the water pipe 94 side (water main pipe side) exceeds the target pressure, the water flowing to the turbine pump 26 flows through the bypass check valve 45, It is bypassed to the discharge side merging pipe 28. Further, a flow rate sensor 46 between the check valve 45 and the pump suction port 30 senses (detects) a decrease in water flow toward the turbine pump 26 (small water flow) and stops the operation of the turbine pump 26. Thereby, the pressurized water from the water main is directly guided to the faucet without increasing the pressure in the water supply device.

At this time, the impeller 34 of the pump unit 25 is rotated by the supply water flowing through the pump unit 25,
The rotor 24b of the DC motor 24 may rotate.

Here, the DC motor 24 is connected to the rotor 2
Since the position of the rotor 4b is detected and controlled and rotated by the current phase flowing through the stator coil 24c, the actual rotation speed of the rotor 24b and the target rotation speed must be synchronized.
Even if a pump start signal is output, the turbine pump 26 does not start. In other words, even if the turbine pump 26 attempts to start, the DC motor 24 is originally stopped and the target rotation speed is 0, but the rotor 24b is rotating. It may not be possible.

Therefore, when the pump is stopped such that the rotor 24b rotates so that the pump can be started satisfactorily after the stop of the pump, the switching unit 21z is used to rotate the rotor 2.
The control for stopping the rotation of 4b is employed.

FIG. 8 shows a flowchart of this control.

That is, at the time of high water distribution, the pump is stopped as shown in steps S1 and S2, and when the rotor 24b rotates by the water supply passing through the inside of the pump section 24 (pulse signal output of the rotor position detection sensor 24d). The control unit 21y operates the switching unit 21z to short-circuit the input terminal of the DC motor (Step S).
3). Then, the DC motor generates a back electromotive force, and generates a braking force for electrically braking the rotor 24b. As a result, a rotational torque in the reverse rotation direction is applied to the rotor 24b, and the rotation of the rotor 24b is reduced to stop. Then, the rotor 24b is held so as not to rotate. That is, the rotor 24b is kept stopped. Note that whether or not the rotor 24b has stopped is determined by whether or not a pulse signal is output from the rotor position detection sensor 24d.

When the suction pressure is lower than the pump starting pressure during the stop of the pump, the controller 21y starts the turbine pump 26.

This start is performed in steps S4 and S5.
As shown in (2), the operation is performed from a state where the rotor 24b is stopped. That is, since the actual rotation speed of the rotor 24b is synchronized with the target rotation speed (zero), the DC motor 24 starts rotating by current phase control.

Therefore, the pump employing the DC motor 24 excellent in reducing the temperature rise can be started smoothly, and the DC motor 24 can be used favorably even at high water distribution.

FIG. 9 shows a second embodiment of the present invention.

This embodiment is a modification of the DC motor start control at the time of high water distribution described in the first embodiment, in which the target rotation speed is synchronized with the actual rotation speed of the rotor when the pump is started. It was made.

Specifically, during the stop of the pump at the time of high water distribution described in the first embodiment, the rotation speed of the rotor 24b is monitored by, for example, the rotor position detection sensor 24d. The control unit 21y is provided with a function of rotating the rotor 24b, which is actually rotating, as the target rotation speed when the pump is started. Instead, the DC motor 24 is favorably rotated by the current phase control. FIG. 8 shows a flowchart of the control at this time.

[0070]

As described above, according to the first aspect of the present invention, a brushless D using a permanent magnet for the rotor.
By using the C motor, it is possible to reduce a rise in the temperature of the housing space containing the pump.

According to the second and third aspects of the present invention, in addition to the above-described effects, there is an effect that a pump employing a brushless DC motor that is stopped during high water distribution can be started smoothly. Play.

[Brief description of the drawings]

FIG. 1 is a front view of a direct water supply type water supply device according to a first embodiment of the present invention.

FIG. 2 is a front view of a cross section of a pump cover of the water supply device.

FIG. 3A is a side sectional view along AA in FIG. 2;
(B) is a sectional side view along BB in FIG.

FIG. 4 is a side sectional view taken along the line CC in FIG. 2;

FIG. 5 is a plan sectional view taken along the line DD in FIG. 2;

FIG. 6 is a view for explaining a suction side merging pipe and a discharge side merging pipe connected to two pumps.

FIG. 7 is an exploded perspective view for explaining the entire structure of the water supply pump.

FIG. 8 is a flowchart for explaining control when a stopped pump is started during high water distribution.

FIG. 9 is a flowchart for explaining control of a main part of a direct water supply type water supply apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 1,85: Stand, pump cover (forming a space for accommodating a pump) 21: Control panel 21y: Control unit 24: Brushless DC motor (motor) 24b: Rotor 24c: Stator coil 24d: Rotor position detection sensor 25: Pump part 26: Pump.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F04D 15/00 F04D 15/00 L 29/58 29/58 DF Term (Reference) 3H020 AA02 AA05 BA01 BA02 BA03 BA04 BA11 BA18 BA24 CA01 CA03 CA04 CA05 CA08 DA01 DA04 DA17 DA21 DA23 DA28 EA12 3H045 AA06 AA09 AA12 AA23 BA43 CA09 CA29 DA07 EA38

Claims (3)

[Claims] A pump in which a pump and a motor for driving the pump are combined is housed in a space surrounded by a wall, and the suction side of the pump is directly connected to a water pipe. A direct water supply type water supply device, wherein a motor for driving the pump unit is a brushless DC motor using a permanent magnet for a rotor. 2. The water supply apparatus according to claim 1, further comprising: a means for applying a rotational torque to the motor in a reverse direction so as to stop the rotation of the motor rotating by water passing through the pump section when the pump is stopped. A direct water supply type water supply device characterized by having: 3. The water supply device according to claim 1, further comprising: a means for monitoring the rotation speed of the rotor when the pump is stopped, and a target rotation speed when the pump is started. A direct water supply type water supply device having means for synchronizing.